Process of making brushes.



N0. 826,119. PATENTED'J'ULY 1'7, 19.06.

H. M. SCHWARTZ. PROGESS OP MAKI BRUSHES. APPLICATION PILE 0 .16.1899.

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H. M. SCHWARTZ. PROCESS 0F MAKING BRUSHES.

APPLICATION FILED NOV. 16. 1899.

PATENTED JULY 17, 1906.

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narran STATES PATENT OFFCE- HERMAN NI. SCIHVARTZ, OF NORTHAMIION, MASSAOIIUSll'lTS, ASSIGNOR TO FLORENCE `MAYUFAL'IURINGr COMPANY, OF NOlt'llIAMITON, SAOI'IUSIQT'IS, A CORPORATION OF MASSACHUSE'I"I`S.

MAS-

PRooEss oF MAKING BRUSHES.

Patented July 17, 1906.

Application filed November 16.1899. 'Serial No. 737,149.

To /tZZ wil/om it may concer/L:

B e it known that I, HERMAN M. SCHWARTZ, a citizen of the United States, residing at Northampton, in the county of Hampshire,v

State of Massachusetts, have invented a cer- `tain new and useful Improvement in Processes of Making Brushes, of which the following is a specification, reference being had i therein to the accompanying drawings. io Heretofore brushes have been made coinprising their construction a back of wood or other suitable material and a bristle-block of molded'composition having` the inner ends of the tufts of the bristles embedded therein. Usually in practice heretofore in the manufacture vof brushes of the class just referred to the bristle-block has been molded to shape in aproper block or die having a cavity correz' which isito be produced and having a number of bristle-receiving holes corresponding in size, number, and arrangement with the tufts of bristles which the completed brush Iis to have: After having been removed from the said block or die the bristle-block has then been inserted and secured in the cavity or recess which has beenformed in the brush-back to receive it.

By the employment of my novel process I am enabled to do away with that'part of the die which has heretofore been einplo ed to form a portion of the brush-'block W -ch is inserted in and engages the corresponding cavity -in the brush-back, since the brushblockis formed directly in the cavity of the brush-back, the saidcavity constituting the die or mold for the brush-block.A I 'am fur-A ther enabled to save considerable manipulation in the formationof the brush-block and also to avoid all the ste s incident to iitting the brush-block to an securing it inthe brush-back, since I :find that the brush-block adheres to the brush-back and does not require to be secured thereto by other means.

My invention will be readily understood from the following description, in whichv reference is made to the accompanying drawings, and the novel features thereof are pointed outl and clearly defined in the claim at the close of this speciiicationk vReferring to the drawings, Figure 1 shows in vertical section a brush and a die used in producing the same in accordance withione spending 'in shape to that of the bristle-block mode of carrying my invention into effect. Fig. 2 isa sectional elevation of a bristle- 5 5 block die with the bristles therein, showing the two parts of the die clamped together ready to receive the plastic composition and illustrates another inode of carrying my in- -veiition iii'to effect. Fig. 3 is an end elevation of the parts which are shown in Fig. 2. Y Having reference first to .F .2 of the drawings, y2 is a die, preferably of metal, having a cavity or recess .7 corresponding with the shape to be given to the bristleblock which is to be produced and also havinga series of holes therein, shown, to receive the tufts of lbristles 3., the said holes corresponding in number and relative location with the number and relative vlocation of the tufts ofbristles in the completed brush.

The bristle-blockmay be formed from composition alone,as is the bristle-bloeli in the brush shownfin Fig. 1,'l or it may have a face-ofmetal.` In Fig. 2 the die 2`is shown as having in the recess or cavity 7 thereof a shell or facing-plate 4, of metal, which is designed to.form the face of the bristle-block. This shell has previously been formed to the required shape bydies 'or the like to lIit'the cavity'in the die 2*,as shown,` and the 'said shell is provided with lioles'which are located to register with the holes in the die 2, so that after the shell or facing-plate has been pl'aced in the cavity of the block or die the bristles 85 maybe caused to'extend through the holes of the facing plate or shell into the holes in the block or die. The other portion of the .die is shown at 6 and consists of a flat plate which serves to cover and inclose the cavity or recess 7 in the die 2. Provision is made for the admission of composition into the cavity or recess thus covered and iiiclosed. In Fig. 2 a hole S is made through the plate 6 for the said purpose, the said hole forming a eentracted opening into the cavity in whichthe bristle-block is 'to be formed. The plate 6 is applied to the die 2, as shown, and is secured thereto by means'of any suitable clamping ineans.- I have shown for this purpose two U-shaped clamps 9, one of which is applied at each side or end of the die 2 and plate 6; The composition from which l the bristleblock is formed is then forced under a proper dition and caused to fill the cavity, flowingA around and embedding the portions of the tufts of bristles Which project into the said cavity and completely filling the shell 4. Inasmuch as the die 2 and plate 6 are' not heated, the com osition sets -and hardens readily, and the p ateo may then be removed andthe bristle-block and bristles taken out of the die 2. The bristle-block is then ready, without any subsequent finishing operation, to be secured to the brush-back.`

Having reference to Fig. 1 of the drawings, the die in which the tufts of bristles are placed is shown at A and corres onds substantially with the bristle-block ie 2, hereinabove described. After the bristle-receiving holes inthe die A have been filled with bristles in 'the well-known manner the back D of the brush is applied to the said die,as shown, Fig. l. The said back D may be of wood or Iequivalent material' and is provided with a recess or cavity H in its face. In Fig. i the inlet for the lastic composition is constituted by a small) hole or opening K, leading from the exterior of the brush to the recess or cavity H therein. The edges L of the back should for the best results be made to fit snuglyagainstthe face of the die in order,

thereby to form a dam and prevent the plastic compositionv fromflowing in between the edges and the die, and thus impairing the finish of the brush or rendering a finishing operation necessary. The brush-back D and l die A are clamped, together by suitable in a highly clamps; (Not shown.) The plastic com osition Whichis to form the bristle-block is then caused to flow under suitable pressure plastic condition linto the .cavity H throug tion fills-the cavity, liowing around an embedding the ends of the tufts of bristles and the opening K. The comdposi adheringviirinl'y to the bottom and sides of the recess in the brush-back- I find in practice that the bristle-block when thus formed in the recess of the brush-'back Will adhere firmly to the back and remain securely in place Without it being necessary to under- -cut the sides of the recesslin the back or otherwise to form the said recess especially to hold the bristle-block in position. When the composition has set and hardened, the brush may be removed. from the die. The hole or opening .K is shown as located centrally of the brush-back and extending directly through the same; but the precise location of the hole or opening is not material so long as it affords an inlet through which the highly plastic composition from which the block E is formed may be caused to flow into and fill the cavity H when the back is in contact with the die, as shown. The hole K may be filled and finished in any desired manner. l

By the process above described4 I avoid many steps which are necessary when the bristle-block is formed independentlyl an afterward secured to the back.

What I claim is- The process herein described of making a brush, which consists in first assembling the bristles in abristle-block die, then appl inga recessed brush-back to the latter, .an forcing composition in a highly plastic state into the cavity between the brush-back'and the die to fill the said cavity, substantially as described.

In testimony whereof Iaffix my signature in presence of two Witnesses.

, HERMAN M. SCHWARTZ. Witnesses:

WMA. MAcLEoD, CHAs. F. RANDALL.

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